💾 Single source state management for ruby
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README.md

Gem Version

Rydux

A ruby gem that brings the functionality of Redux to your backend.

Installation

Add this line to your application's Gemfile:

gem 'rydux'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rydux

Usage

  1. Require the gem somewhere in the root of your application (or somewhere the store will be accessible everywhere you need it).
  2. Create some reducers in your application, you can place them anywhere, but a reducers/ directory is recommended. A sample reducer looks something like this:
# reducers/user_reducer.rb

class UserReducer < Rydux::Reducer

  # Your reducer MUST have a map_state function in order to do anything.
  def self.map_state(action, state = {})
    case action[:type]
    when 'SOME_RANDOM_ACTION' # You can add as many actions here as you'd like
      state.merge(some_random_data: true)
    when 'APPEND_PAYLOAD'
      state.merge(action[:payload])
    else
      state
    end
  end

end
  1. Create a store somewhere easily accessible in your application:
  require 'reducers/user_reducer'

  # The key passed into .new here is the key at which this value
  # will be stored in the state. E.g. { user: whatever_user_state }
  Store = Rydux::Store.new(user: UserReducer)
  1. Have something subscribe to the store:
  class MyClass
    def initialize
      Store.subscribe(self)
    end

    # Every instance that subscribes to the store will
    # get this state_changed method called whenever the state
    # in the store changes. Do whatever you want with your state here.
    def state_changed(state)
      # ...
    end
  end
  1. To update the store with new data, you can dispatch actions, like so:
  Store.dispatch(type: 'SOME_RANDOM_ACTION')

Putting it all together:

require 'rydux'

class UserReducer < Rydux::Reducer
  @@initial_state = { name: 'Alex', age: 20 }

  def self.map_state(action, state = @@initial_state)
    case action[:type]
    when 'CHANGE_USER_NAME'
      state.merge(name: action[:payload][:name])
    else
      state
    end
  end

end

Store = Rydux::Store.new(user: UserReducer)

class Friend
  def initialize
    Store.subscribe(self)
    @users_name = Store.state.user.name
  end

  def state_changed(state)
    @users_name = state.user.name
  end

  def greet_user
    puts "Hello, #{@users_name}"
  end
end

# Create a new friend (this will subscribe it to the store)
friend = Friend.new
friend.greet_user #=> Hello, Alex

# Change a value in the store
Store.dispatch(type: 'CHANGE_USER_NAME', payload: { name: 'Mike' })
friend.greet_user #=> Hello, Mike

View the Documentation for more information on methods and parameters

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/alexdovzhanyn/rydux. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Rydux project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.